Taken from ANN:
Aozora Yell centers on Tsubasa, a girl who saw an inspirational brass band performance at the finals of the Japanese high school baseball championships one summer. Tsubasa vows to join the band when she enters high school, and she happens to meet a certain boy there.

New Series from the mangaka of Koukou Debut

The series Aozora Yell has been licensed, it is not available in Manga Fox.